Power-gearing.



W. H. HAMPTON.

POWER GEARING APPLICATION FILED JAN. 30, 1907.

Patented Apr. 19, 1910.

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W. H. HAMPTON.

POWER GEARING.

APPL IGATION FILED JAN. 30, 1907.

Patented Apr. 19, 1910..

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POWER GEARING.

APPLICATION FILED JAN. 30, 1907 Patented Apr. 19, 1910.

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POWER-GEARING.

Specification of Letters Patent.

Patented Apr. 19, 1910.

Application filed. January 30, 1907. Serial No. 354,899.

To all whom it may concern:

Be it known that I, WILLIS H. HAMPTON, a citizen of the United States,residing at Canaseraga, in the county of Allegany and State of New York,have invented certain new and useful Improvements in Power- Gearing, ofwhich the following is a specification.

My invention relates to an improved power-gearing whereby rotary motionis converted into linear motion at a greatly reduced speed; it beingespecially designed for use in conjunction with a fence wire-clamp so asto stretch the wires preparatory to fastening to the fence posts, but itis clearly apparent that it may be used in all places where a powerfulslow linear movement is desired, such as is required in raising heavyloads, binding loads of hay, or producing a powerful pull upon a chain,cable, or similar object, with a comparatively small driving force.

lhe objects of my invention are, the production of a device of thischaracter which is light, strong, and inexpensive, and which is highlyefficient and quickly adjustable to the various conditions under whichit may be placed into action; to so construct the device that it will beself-locking against retrograde action, and will at all times while inuse sustain the load or strain without the use of pawls, or otherbraking or lookingdevices when the driving force is removed; and tootherwise improve on devices of this character now in use.

To these ends, the invention consists in the construction, formation,arrangement, and combination of parts to be hereinafter described, andmore particularly pointed out in the appended claims.

Reference is to be had to the accompanying drawings in whichcorresponding numerals of reference refer to corresponding parts in theseveral figures.

Figures 1 and 2 are opposite side elevations of my improved device. Fig.3 is a top plan view of the same. Fig. 4 is a diametral section taken online mm, Fig. 1. Fig. 5 is a diametral section taken on line y-y,Fig. 1. Fig. 6 is a perspective view of the inner end of theoperating-handle. Fig. 7. is a section taken on line zz, Fig. 5. Fig. 8is a detached perspective view of the external gear with its integralparts. Fig.

9 is a diagrammatic view of the internal gear showing the manner ofgenerating the teeth therein. Fig. 10 is a diagrammatic view of theexternal gear, showing the mannor of generating the teeth thereon. Fig.11 1s a side elevation of the intermeshed gearing showing the manner offorming the flanks and faces of the teeth. Fig. 12 is a side elevationof the complete intermeshed gears.

- The reference numeral 1 designates a wire clamp having the wires 2 ofa fence clamped therein, which wires are to be stretched by my improveddevice 3, preparatory to fastening to the fence posts. As hereinbeforestated, I do not wish to confine myself to conjunctive use with a wireclamp, but simply illustrate the device in use for one of many purposesto which it is adapted.

4L designates an external gear-wheel which may either be fastened to theobject to be moved or to a fixed object or anchor; but I have hereinshown the same connected to the object to be moved, illustrated as thewirec1amp above referred to. Said gear has formed integrally therewith aloop 5 having a contracted outer end and an arm 6 arranged at an angleto said loop and having at its outer extremity a slot 7 for connectionwith the wire clamp. Loop 5 and arm 6 may, however, be separably formedand applied to gear 4 in any practicable manner. A chain 8 is providedfor connection between loop 5 and the wire-clamp; it having one endthereof secured to said clamp, and at a suitable point it is passedthrough the enlarged portion of loop 5 and drawn into the contracted endof the latter to cause one of the links of the chain to engage the sidesof the loop so as to securely connect it thereto. In this manner thepoint.

of connection of chain 8 to the said loop can be changed to vary theline of pulling strain, as may be required; and by reason of the pointsof the connections of said chain and arm to the wire-clamp being somedistance apart, wabbling or rotation of the device in a planeperpendicular to the line of straining force is impossible,'thusassuring a fixed position when under strain.

Gear 4 is arranged within and meshes with an internal gear 9 and has theteeth of the latter meshing therewith. Said internal gear has a centralopening 10 in which fits a sleeve or bushing 11 formed on anoperating-handle 12 at the inner end thereof. Said bushing is providedwith a bore 13 arranged eccentrically therein and passing through saidbore is a stud 1% extending axially from the gear Said stud projectsthrough said bore and has its outer end threaded to receive asecuring-nut 15; or if desired, a washer and cotter-pin may be used atthis point. In this manner, the parts are maintained in operativerelation, and upon revolving the operating-luindle, the bushing revolveswithin the opening in the internal gear and around the stud of theexternal gear. Since the external gear a is held in a fixed position, itfollows that the internal gear 9 must travel around said external gearand that by reason of its being mounted on the eccentric bushing andbeing in mesh with the external gear, it is given a combined oscillatingand rotary motion whereby each tooth thereof is caused to engage theteeth of the external gear successively, causing a very slow rotarymot-ion of the internal gear, advancing one tooth upon the external gearduring a complete revolution of said eccentric bushing.

The eccentricity or throw of he eccentric bushing 11 is in a plane at aright-angle to the operating-handle so that the greatest strain will beexerted upon the bushing when the handle is passing downward, andminimum strain will occur when the handle is moving upward. This isparticularly de sirable in a hand-operated device, as thegreatestresistance -is encountered during that portion of the revolutionwhen most power can be exerted on the operating-handle, and the variablework on chain 22 thus harmonizes with the variable effort one is able toexert upon the operating-handle. The internal gear 9 has a chain, rope,or cable-bearing periphery; herein shown in preferred form, with twocircumferential series of teeth 17, and its construction comprises inintegral form, a hub 18, radial arms 19, and a rim having openings 21between the arms. The teeth 17 are arranged in pairs and in planescentral between said arms so that the links of a chain 22 lying fiatagainst the periphery of the wheel will enter the spaces between thesuccessive pairs of teeth of the two series, while the links standingperpendicular to the face of the wheel rim enter the openings 21 betweenthe arms 19 and the spaces between alined teeth. Chain 22 is secured toan anchor or fixed point, and upon revolving the operatinghandle it isapparent that the device is drawn toward the anchor or fixed point byreason of its moving along the chain in a manner similar to a gear-wheeltraveling upon a gear-rack. lVhen lifting a load and for many otherpurposes, the arm 6 and chain 8 may be secured to an anchor or fixedpoint while the chain 22 is attached to the object to be moved. Theeccentric bushing is of a length to provide a good bearing for theinternal gear and so that it extends beyond the line of strain of chain22, thus assuring a solid bearing for the internal gear-wheel.

In order to produce a self-locking device under strain, without the useof pawls, brakes, or other similar devices, and to obtain the greatestreduction in speed, the gears should differ by a single tooth so thatthe internal gear advances only one tooth during a complete revolutionof the eccentric bushing. \Vhen so constructed, the axes of the gearsare so close together that it is impossible to reverse the gears bytension on chain 22. That these gears may be so nearly equal indiameter, and their teeth clear and work together, it is necessary toprovide a 35 special form of teeth. This I accomplish by formingepicycloidal teeth generated or described by rolling or generatingcircles of a size in diameter equaling or less than onehalf thedifference in diameter of the two pitch circles of the gears; butpreferably one-half of said difierence, as clearly shown in Figs. 9 and11; in which 23 is the pitch circle of the internal gear, Qt the pitchcircle of the external gear, and 25 the rolling or generating circles.hen so formed, the teeth not only properly escape, but the faces of theteeth of the internal gear will work against the faces of the teeth ofthe external gear along the medial circle 26 indicated in broken linesin Fig. 11, which is a mean between the pitch circles of both gears.This results in a long are of contact with very small obliquity ofaction and minimum sliding action of the teeth upon each other, and thisalso gives a very short and consequently a very strong tooth, so thatthe gears may be made small, very light, and powerful; but to furtherreduce the size of the gears, the height of the teeth are reduced sothat the toothed rim or flange of the internal gear need not be as thickas would be necessary if the exact form of teeth generated by therolling or generating circles were retained. The reduction in height ofthe teeth also renders the same more effective.

The gears herein shown are in the ratio of five tosix; the arc ofcontact and obliquity of action being as satisfactory as in a wheel of amuch larger number of teeth formed in the ordinary way with a rolling orgenerating circle six times the pitch at least. By using a larger numberof teeth for the gears but retaining the difference of one tooth betweenthem, these advantages are amplified.

While my invention is designed primarily for use in exerting a slow andpowerful pulling action upon a chain, cable or other object with acomparatively small driving force, it is clearly apparent that it wouldrequire only the skill of an ordinary mechanic to connect theinternal-gear with mechanism to be revolved, so that powerful and slowrotary movement can be obtained instead of the lineal movementdescribed.

Having thus described my invention, what- I claim is,

1. A device of the character described, comprising an external gear heldagainst rotation and having a stud extending axially therefrom, aneccentric rotatable on said stud, and an internal gear mounted on saideccentric and in mesh with said external gear.

2. A device of the character described, comprising an external gear heldagainst rotation and having a stud extending axially therefrom, anoperating-handle having an eccentric bushing at its inner end fittingonto said stud and revoluble thereon when actuating said handle, and aninternal gear mounted on said bushing and being in mesh with saidexternal gear.

8. A device of the character described, comprising an external gear heldagainst rotation and having a stud extending axially therefrom, anoperating handle having an eccentric bushing at its inner end fittingonto said stud and revoluble thereon when actuating said handle, saidbushing having its eccentricity or throw in a plane at an angle to thehandle, and an internal gear mounted on said bushing and being in meshwith said external gear.

In testimony whereof, I have aflixed my signature in the presence of twosubscribing witnesses.

WILLIS I-I. HAMPTON.

Witnesses:

CHAS. A. SHAY, OSCAR E. SHAY.

